Tyr

In Norse* mythology, Tyr was worshiped as a god of war, justice, and
order. One of his roles was to guarantee that contracts and oaths were not
broken.

Although Tyr appears in very few legends, the best-known story about him
involves the fierce wolf Fenrir that no chain could hold. The supreme god
Odin ordered the dwarfs to make a magical ribbon so strong that Fenrir
could not break it. Fenrir was suspicious when the gods wanted to tie the
ribbon around him. But he allowed himself to be bound after brave Tyr put
his hand in the wolf's mouth. However, when Fenrir realized that he had
been tricked, he bit off Tyr's hand.

Early Germanic peoples associated Tyr with Mars, the Roman god of war. The
third day of the week, known as
dies Martis
(Mars' Day) in Latin, became known as
Tyrsdagr
to the Norse and entered English as Tuesday.